Sudo apt update shows uninstalled apps

sudo apt update shows me the following:

Hit:1 http://ppa.launchpad.net/kisak/kisak-mesa/ubuntu focal InRelease
Hit:2 http://ie.archive.ubuntu.com/ubuntu focal InRelease                      
Hit:3 http://ppa.launchpad.net/zorinos/apps/ubuntu focal InRelease             
Hit:4 https://dl.winehq.org/wine-builds/ubuntu focal InRelease                 
Hit:5 http://ie.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:6 http://ppa.launchpad.net/zorinos/drivers/ubuntu focal InRelease          
Hit:7 http://archive.canonical.com/ubuntu focal InRelease                      
Hit:8 http://ppa.launchpad.net/zorinos/patches/ubuntu focal InRelease          
Hit:9 http://ppa.launchpad.net/zorinos/stable/ubuntu focal InRelease           
Hit:10 http://ie.archive.ubuntu.com/ubuntu focal-backports InRelease           
Hit:12 http://security.ubuntu.com/ubuntu focal-security InRelease              
Hit:13 https://brave-browser-apt-beta.s3.brave.com stable InRelease            
Hit:11 https://deb.librewolf.net focal InRelease                               
Hit:14 https://packages.zorinos.com/stable focal InRelease                  
Hit:15 https://packages.zorinos.com/patches focal InRelease
Hit:16 https://packages.zorinos.com/apps focal InRelease
Hit:17 https://packages.zorinos.com/drivers focal InRelease
Reading package lists... Done

Now, I uninstalled librewolf, winehq and brave via --purge. To me this looks like it didn't properly remove them. Is there any program which would help me purge them for good?

You are not seeing the applications there, you are seeing the Repositories for those apps. The apps are gone.
If you like, you can remove those repos either with terminal command

sudo add-apt-repository --remove (PPA NAME)

Or in Software & Updates, move to the "Other software" tab and scroll through the list looking for those repos. Click on one you wish to remove to select it. Then click the remove button.

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You can delete them in the software & update them in the software store as @Aravisian said;

then click on other software and there you can remove what you want.

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